Conodont data in relation to sequences about the Pragian-Emsian boundary (early Devonian) in south-eastern Australia

Conodont data enable approximate alignments to be made with respect to the Pragian-Emsian boundary using as criterion the first appearance of Polygnathus dehiscens (over-lapping with P. pireneae). At Wee Jasper, the boundary is inferred to occur approximately 35m below the "Cavan Bluff Limestone'. The Heath's Quarry carbonate buildup at South Buchan is argued to have continued upward growth long after the transgressive event reflected in the spreading of the pelagic Taravale facies over the Buchan Caves Limestone in the Buchan-Murrindal-The Basin area. At Bindi, following this last transgressive event, carbonate sedimentation continued; The Buchan Caves Limestone there ascends from the dehiscens Zone into the perbonus Zone. Samples from Boulder Flat and Tabberabbera indicate the presence of the latest Pragian pireneae-trilinearis interval, the productive samples at Tabberabbera including clasts in the basal unit, the Wild Horse Formation. -from Authors